TM 9-2350-247-20-1THEORY OF OPERATION  Continued 0003 00OIL COOLING SYSTEM COMPONENTS  ENGINE, TRANSMISSION, AND DIFFERENTIALThe M548A1 engine, transmission, and differential oil cooling systems keep the oil clean and within proper operatingtemperature range. The components of the system are the engine, transmission, and differential oil cooler unit is mounted onthe engine. By circulating the hot oil through this unit, heat is given off to the surrounding engine coolant. Engine coolant isin turn cooled by the engine cooling system.Oil cleanliness is maintained by circulating engine oil through the engine oil filter and differential oil through the differentialoil filter. Transmission oil is cleaned by the transmission oil filter which is an integral part of the transmission.Differential oil pump is mounted on the transfer gearcase. It pumps oil from the bottom of the differential housing to thedifferential oil filter. Oil flows through the filter and cooler and back to top of differential. a power takeoff within the transfergearcase drives the differential oil pump.0003 00-2